DOWNLOAD LG 42LC4D (CHASSIS:LA73E) Service Manual ↓ Size: 11.11 MB | Pages: 46 in PDF or view online for FREE

Model
42LC4D (CHASSIS:LA73E)
Pages
46
Size
11.11 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lc4d-chassis-la73e.pdf
Date
PREV: LG 42LC3RA (CHASSIS:LN62A) Service Manual

LG 42LC4D (CHASSIS:LA73E) Service Manual ▷ View online

- 41 -
- RGB_PC doesn't display
Check input c
onnect P7004.
Can y
o
u see t
h
e n
o
rmal 
w
av
e
form?
Check the input of Component 
sw
itch(IC5002). 
Can y
o
u see t
h
e n
o
rmal 
w
av
e
form?
Check th
e o
u
tput o
f Co
mponent 
sw
itch(IC5002). 
Can y
o
u see t
h
e n
o
rmal 
w
av
e
form?
Check th
e in
put o
f MST
3361
(IC7004 
Pin41,44,46).
Can y
o
u see t
h
e n
o
rmal 
w
av
e
form?
YE
S
YE
S
YE
S
NO
P7004  may
 h
a
ve
 problem. Replace this Jack.
Check the output of
 MST3361(IC7004 ).
Can y
o
u see t
h
e n
o
rmal 
w
av
e
form?
YE
S
Check th
e in
pu
t an
d 
outpu
t of 
BCM3550(IC4006). Especially
 y
ou should 
ch
eck
The
 H,V sy
nc and clock.
Can y
o
u see t
h
e n
o
rmal 
w
av
e
form?
YE
S
NO
A
fte
r checking the i
nput
 TR
 of RGBHV, y
ou 
should decide
 to replace these components or 
not.
NO
NO
Af
te
r ch
ec
kin
g th
e Po
w
er of MST
3361 
you 
should decide
 to replace MST3361 or not.
NO
YE
X
This board ha
s big 
problem
 because Main 
chip(BCM3
550) 
hav
e some trouble
s.
A
fter checking thorough
ly
 all path 
once 
again, 
You should decide to replace BCM3550 o
r not.
A
fte
r ch
ec
kin
g th
e Po
w
er of RGB s
w
itch
 y
ou 
should decide
 to replace component s
w
it
ch or 
not.
Af
te
r ch
ec
kin
g th
e Po
w
er of MST
3361 
you 
should decide
 to replace MST3361 or not.
- 42 -
- HDMI doesn't display
Check input c
onnect P7007.
Can y
o
u see t
h
e n
o
rmal 
w
av
e
form?
Check DDC commu
nication lines(IC7013 
Pin5,6)
Check th
e in
pu
t o
f MST
3361
(IC7004)
This signal is 
TMDS.
Can y
o
u see t
h
e n
o
rmal 
w
av
e
form?
YE
S
YE
S
NO
P7007 may
 hav
e problem. Replace this Jack.
Check the output of
 MST3361(IC7004 ).
Can y
o
u see t
h
e n
o
rmal 
w
av
e
form?
YE
S
Check th
e in
pu
t an
d 
outpu
t of 
BCM3550(IC4006). Especially
 y
ou should 
ch
eck
The
 H,V sy
nc and clock.
Can y
o
u see t
h
e n
o
rmal 
w
av
e
form?
YE
S
NO
NO
A
fte
r ch
ec
kin
g th
e trace o
f 
TMDS lin
es a
n
d po
w
er
 o
f 
MST3361, y
ou should decide to replace MST3361 or 
not.
NO
YE
X
This board ha
s big 
problem
 because Main 
chip(BCM3
550) 
hav
e some trouble
s.
A
fter checking thorough
ly
 all path 
once 
again, 
You should decide to replace BCM3550 o
r not.
A
fte
r 
checking the Po
w
er 
of this chip, y
ou 
should decide
 to replace this or not.
Af
te
r ch
ec
kin
g th
e Po
w
er of MST
3361 
you 
should decide
 to replace MST3361 or not.
YE
S
Check HD
CP co
mmunicatio
n lin
es(IC7005
 
Pin5,6)
NO
A
fte
r 
checking the Po
w
er 
of this chip, y
ou 
should decide
 to replace this or not.
- 43 -
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- 43 -
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